Split drum winding machine



Dec. 18, 1934. A. LACHE SPLIT DRUM WINDING MACHINE 2 Sheets-Sheet 1Filed Jan. '25, 1934 Dec. 18, 1934. v A LACHE 1,985,175

SPLIT DRUM WINDING MACHINE Filed Jan. 25, 1934 2 Sheets-Sheet 2 PatentedDec. 18, 1934 willer,i:France applieetienire eryzs, i934, seem-o.708,326

The object of the present invention is a split mdrum winding framedevice inrwhich-in order to avoid variable tensioning of the thread saidthread onlygoes through the drumaccord-ing to a secant 'subtendingan arc,of small -arnplitude,

thepoints of entrance and-of exitof the thread .bemgthus-positioned inclose proximity and the t a b n e -mine ld um ip edtioned within said.drum' and under. which. said threadpasses.

The winding device which forms the subject matter oftheLinvention-posseses the following features I 1.The strip positionedwithin the drum is split obliquely i-n-its-eenter, the front edge of theslitt presents a raised beak which determines the automatic engagementof the thread under the strip and the rear edge is also slightly raisedin order to allow the automatic exit of the thread when the bobbin movesout of contact with the drum.

2.In its middle portion the drum is provided with a thread catching slotsimilar to that which exists on the split drum winding machines of thetypes known at present, said slot acting in combination with the strip,as defined in 1, to obtain automatic and instantaneous engagement of thethread under the strip.

0n the attached drawings:

Figure 1 is a diagram, in section, of a split drum winding deviceconstructed according to the invention;

Figures 2 and 3 show, in elevation and in perspective, the manneraccording to which the stripis to be wound passes through the drumalmost according to a diameter of said drum. I

In passing through the drum in this manner the thread. is subjected to atension the magnitude of which varies according to the position of thewinding-on point on the bobbin. On the points of the slot, that is'tosay when the winding on of the thread is on the edges of the bobbin, thetension to which said thread is subjected is very much greater than whenit is engaged in proximity to the middle of the slot.

In order to overcome this difficulty, winding machines in which thethread passes through the n l en a e InFranc iF ruary ,933

are of "small amplitude Lhave lalreadyf been imagined,thefpointslotentrance and exit of the thread thusbeirig close p im t oa hs-gu s:

,surface of-thedrurn. I 1.. 1 y This arrangement,enecessitatesea specialorgan ,whichlpreuentsthe threadfrorn coming .out of the slot; thisspecial organ is constituted by an inside strip underneath which thethread is con- Thisdevice gives excellent resl'lltS but it has, the

disadvanta e e "n cess atin .a com a at vely lo m fo hread n the t dntq' he le and under the strip; indeed, as said strip is'corrs ituted by.a, single, cross piece which only permits of the engagement of thethread by'one of its extremities, it will readily be seen that, in ordcrthat it may be possible to pass the thread underneath the strip, it willbe necessary to pro-'- vide one or more leads to the slot, said leadsterminating at the edges of the drum in openings in which the thread isheld by hand while the drum is rotated in order to obtain the passage ofthe thread underneath the strip. 7

The device which forms the subjectmatter of the present inventionpresents all the advantages of the split drums of the types aboveindicated but makes it possible to eliminate the disadvantages by makingthreading absolutely automatic as in the case of ordinary split drumwinding machines.

As will be seen on the drawings, in a split drum winding machineconstructed according to the invention, strip 1 positioned within thedrum is held in proper position by a counterweight 2. The strip properis provided, at its center, with an oblique slot 3 and, on the edge ofsaid slot,

on the side towards which the engagement of the thread occurs is araised beak 4 terminated by a hook 45 under which the thread slips atthe moment when it .drags in the thread catching slot of the drum sothat when the thread is pushed laterally by oblique slot '7 of said drumit'is compelled to follow slot 3 and to locate itself under-- neath thestrip. I I

The rear edge of slot 3, on the side opposite to that which bears beak4, is slightly raised at point 6, this beak like conformation is howeverless pronounced than in the case of beak 4.

The drum is set up in the usual manner, that when starting up thewinding machine or after mending a break, it is suificient to place thebobbin which is in course of filling into contact with the drum to causeit to rotate; the engagement of the thread in the drum takes placeautomatically and in the following manner:

When bobbin 8 which is to be filled is applied onto the drum the threaddrops into thread catching slot 5 (position shown, in Figure 5); itcomes into engagement beneath hook 4 then, following slot 3, itpositions itself under the strip as soon as oblique slot '7 of the drumpushes it laterally (position shown in Figure 6). As soon as infollowing slot 3 the thread has escaped through exit 6 of the slot, itremains held underneath strip 1 when being wound by sliding under beak6'.

It will be seen that this operation ofengagement of the thread occursowing to the device which forms the subject matter of the invention inan entirely automatic manner and without necessitating any specialoperation.

Beak 6' is raised only just to the extent neces sary to maintain thethread underneath the strip in this position at the moment of winding sothat when the bobbin is raised (position shown in Figure 7) the threadforms an angle with the plane of the strip and, sliding on the innersurface of beak 6', it tends to engage above said beak and this occursas soon as, owing to the rotation of the drum, oblique slot '7 of saiddrum exerts a lateral pressure on said thread; the thread is then drivenout of the drum (position shown in Figure 8).

It will be appreciated that this arrangement is particularlyadvantageous in the case of assembling threads when, on account of thebreakage of one of the ends, the bobbin is automatically raised for, inthis case, owing to the device described, the broken thread, or threads,which are not broken are released and do not continue to follow the toand fro movement of the drum.

It is to be understood that the shapes given'to beaks 4 and 6' and tohook l may be varied slightly according to the dimensions of the drumand also according to the position of the winding bobbin on said drumand that the invention may be'embodied in other forms within the scopeof the following claims.

What I claim is:

1. A winding machine of the type described comprising, in combination, adrum, a thread catching slot on said drum, an oblique slot on said drumand a strip positioned within said drum, said strip being slottedobliquely along its center. I v

2. A winding machine of the type described comprising, in combination, adrum comprising at its medial portion a thread catching slot, a

second slot on the same said drum extending obliquely along the wholelength of said drum and a strip positioned within said drum, said stripbeing obliquely slotted along its center, the front edge of said slot ofsaid strip being provided with means co-operating with said threadcatching slot of said drum for the purpose of causing the automatic andinstantaneous engagement of the thread underneath said strip.

AUGUSTIN LACHE'.

